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We d like a way to gather up objects as they are created so that we can manage them as a group and operate on them collectively, along with referring to them individually when necessary, for example: A professor may wish to step through all Student objects registered for a particular course that the professor is teaching in order to assign their final semester grades. The Student Registration System (SRS) application as a whole may need to iterate through all of the Course objects in the current schedule of classes to determine if any of them should be canceled due to insufficient enrollment.

The last common pattern we ll look at involves doing some extra work before or after calling the generic view. Imagine we had a last_accessed field on our Author object that we were using to keep track of the last time anybody looked at that author. The generic object_detail view, of

We use a special type of object called a collection to organize other objects. Think of a collection like an egg carton, and the objects it holds like the eggs: both the egg carton and the eggs are objects, but with decidedly different properties.

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For example, account transfer transactions in a banking system normally consist of (at least) two updates: a debit to account A and a credit to account B. In such situations, it makes a lot of sense to COMMIT after each debit/credit combination, and not in between each update. What if something went wrong (for example, the system crashed) after the debit update was committed but the credit update had not been processed yet You would end up with corrupted administration records. Moreover, even in the absence of any disasters, a different database user could start a reporting application precisely at the wrong moment in between the two updates, which would result in inconsistent financial reports. On the other hand, if you wait too long before committing your changes, you risk losing your work when the system crashes. During system .recovery, all pending transactions will be rolled back to guarantee database consistency. This may be annoying, but it s necessary. By the way, this illustrates the fact that not only database users are able to issue explicit COMMIT and ROLLBACK commands. Oracle tools can also issue those commands implicitly. For example, if you leave SQL*Plus in a normal way with the EXIT or QUIT command, or if you create a new session with the SQL*Plus CONNECT command, SQL*Plus first sends a COMMIT command to the database. Another consequence of a delayed committing of your changes is that you block other database users who want to update or delete the same rows. Section 6.6 discusses this locking behavior in a little more detail.

The Java language predefines a number of different collection classes. As with any class, a collection object must be instantiated before it can be put to work. That is, if we merely declare a reference variable to be of a collection type: CollectionType<elementType> x; for example: ArrayList<Student> x; // ArrayList is one of Java's predefined collection types.

course, wouldn t know anything about this field, but once again we could easily write a custom view to keep that field updated. First, we d need to add an author detail bit in the URLconf to point to a custom view: from mysite.books.views import author_detail urlpatterns = patterns('', #... (r'^authors/( P<author_id>d+)/$', author_detail), ) Then we d write our wrapper function: import datetime from mysite.books.models import Author from django.views.generic import list_detail from django.shortcuts import get_object_or_404 def author_detail(request, author_id): # Look up the Author (and raise a 404 if she's not found) author = get_object_or_404(Author, pk=author_id) # Record the last accessed date author.last_accessed = datetime.datetime.now() author.save() # Show the detail page return list_detail.object_detail( request, queryset = Author.objects.all(), object_id = author_id, ) This code won t actually work unless you add a last_accessed field to your Author model and create a books/author_detail.html template. We can use a similar idiom to alter the response returned by the generic view. If we wanted to provide a downloadable plain-text version of the list of authors, we could use a view like this: def author_list_plaintext(request): response = list_detail.object_list( request, queryset = Author.objects.all(), mimetype = "text/plain", template_name = "books/author_list.txt" ) response["Content-Disposition"] = "attachment; filename=authors.txt" return response

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